public void TopX_NoChanges_CorrectResult()
{
INotifyCollection <Dummy <int> > collection = new NotifyCollection <Dummy <int> >();
var top1 = new Dummy <int>(43);
var top2 = new Dummy <int>(42);
var top3 = new Dummy <int>(30);
collection.Add(top1);
collection.Add(new Dummy <int>(5));
collection.Add(new Dummy <int>(7));
collection.Add(new Dummy <int>(1));
collection.Add(new Dummy <int>(27));
collection.Add(new Dummy <int>(25));
collection.Add(new Dummy <int>(13));
collection.Add(new Dummy <int>(17));
collection.Add(new Dummy <int>(7));
collection.Add(top2);
collection.Add(top3);
collection.Add(new Dummy <int>(23));
collection.Add(new Dummy <int>(6));
var topEx = Observable.Expression(() => collection.TopX(3, d => d.Item));
var top = topEx.Value;
Assert.AreEqual(top1, top[0].Key);
Assert.AreEqual(top2, top[1].Key);
Assert.AreEqual(top3, top[2].Key);
Assert.AreEqual(3, top.Length);
}
public void TopX_Clear_CorrectResult()
{
INotifyCollection <Dummy <int> > collection = new NotifyCollection <Dummy <int> >();
var top1 = new Dummy <int>(43);
var top2 = new Dummy <int>(42);
var top3 = new Dummy <int>(30);
collection.Add(top1);
collection.Add(top2);
collection.Add(top3);
collection.Add(new Dummy <int>(23));
collection.Add(new Dummy <int>(6));
var topEx = Observable.Expression(() => collection.TopX(3, d => d.Item));
var top = topEx.Value;
Assert.AreEqual(top1, top[0].Key);
Assert.AreEqual(top2, top[1].Key);
Assert.AreEqual(top3, top[2].Key);
Assert.AreEqual(3, top.Length);
var changed = false;
topEx.ValueChanged += (o, e) =>
{
Assert.IsNotNull(e.OldValue);
Assert.IsNotNull(e.NewValue);
changed = true;
};
collection.Clear();
Assert.IsTrue(changed);
Assert.AreEqual(0, topEx.Value.Length);
}
public void TopX_NoObservable_CorrectResult()
{
var collection = new NotifyCollection <Dummy <int> >();
var top1 = new Dummy <int>(43);
var top2 = new Dummy <int>(42);
var top3 = new Dummy <int>(30);
collection.Add(top1);
collection.Add(new Dummy <int>(5));
collection.Add(new Dummy <int>(7));
collection.Add(new Dummy <int>(1));
collection.Add(new Dummy <int>(27));
collection.Add(new Dummy <int>(25));
collection.Add(new Dummy <int>(13));
collection.Add(new Dummy <int>(17));
collection.Add(new Dummy <int>(7));
collection.Add(top2);
collection.Add(top3);
collection.Add(new Dummy <int>(23));
collection.Add(new Dummy <int>(6));
var top = collection.TopX(3, d => d.Item);
Assert.AreEqual(top1, top[0].Key);
Assert.AreEqual(top2, top[1].Key);
Assert.AreEqual(top3, top[2].Key);
Assert.AreEqual(3, top.Length);
}
public void TopX_EmptyMultipleAdd_CorrectResult()
{
INotifyCollection <Dummy <int> > collection = new NotifyCollection <Dummy <int> >();
var top1 = new Dummy <int>(43);
var top2 = new Dummy <int>(42);
var top3 = new Dummy <int>(30);
var changed = false;
var topEx = Observable.Expression(() => collection.TopX(3, d => d.Item));
topEx.ValueChanged += (sender, args) => changed = true;
var top = topEx.Value;
Assert.AreEqual(0, top.Length);
collection.Add(top2);
top = topEx.Value;
Assert.IsTrue(changed);
Assert.AreEqual(top2, top[0].Key);
Assert.AreEqual(1, top.Length);
changed = false;
collection.Add(top1);
collection.Add(top3);
top = topEx.Value;
Assert.IsTrue(changed);
Assert.AreEqual(top1, top[0].Key);
Assert.AreEqual(top2, top[1].Key);
Assert.AreEqual(top3, top[2].Key);
Assert.AreEqual(3, top.Length);
changed = false;
collection.Add(new Dummy <int>(22));
Assert.IsFalse(changed);
Assert.AreEqual(top, topEx.Value);
var newTop3 = new Dummy <int>((top3.Item + top2.Item) / 2);
collection.Add(newTop3);
top = topEx.Value;
Assert.IsTrue(changed);
Assert.AreEqual(top1, top[0].Key);
Assert.AreEqual(top2, top[1].Key);
Assert.AreEqual(newTop3, top[2].Key);
Assert.AreEqual(3, top.Length);
}
